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Robin Thicke and Pharrell Williams maintain that they did not rip off Marvin Gaye in the making of their hit song "Blurred Lines." As the trial draws to a close, ET has one of the recordings played in the courtroom that could make the jury turn against them.

"I think Pharrell Williams' testimony is the most critical in this trial, because he's the one who created the song," Pamela Chelin, freelance journalist for The Wrap, told ET. "He wrote the song in an hour by himself. If anybody knows the intention behind the song, it's Pharrell."

The main question at hand seems to be, Is "Blurred Lines" a copy of "Got to Give it Up"?

There's a lot of money at stake as "Blurred Lines" reportedly made more than $16 million in profit. Robin Thicke reportedly made $5.6 million, while Pharrell reportedly made $5.1 million.

"Pharrell's position on interviews that were shown in court when he said that he was inspired by Marvin Gaye is that he only realized that retroactively," Pamela said. "That looking back on the song he realized he must have been channeling the late '70s when he wrote and recorded it."

Robin also claims that he was "high on Vicodin and alcohol" when the song was written.

"The biggest hit of my career was written by somebody else, and I was jealous and wanted credit," the singer said in court.